Business Combinations - Aggregated Consideration And Preliminary Purchase Price Allocation (Details) - Series of Individually Immaterial Business Acquisitions - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Business Acquisition, Contingent Consideration [Line Items]
Cash paid	$ 72,469	$ 1,900
Recorded contingent consideration	64,648	1,622
Total recorded purchase price	137,117	3,522
Accounts receivable acquired	18,230	0
Fixed assets acquired	1,793	0
Identifiable intangible assets acquired	48,000	2,069
Operating lease right-of-use asset acquired	49,291	0
Other assets acquired	1,497	0
Operating lease liability acquired - current	(5,860)	0
Other current liabilities acquired	(909)	0
Operating lease liability acquired - noncurrent	(43,431)	0
Goodwill	68,506	1,453
Total net assets acquired	137,117	3,522
Maximum potential contingent consideration	$ 67,115	$ 1,700